Unavailability of iptables-multiport on VPS about fail2ban HOT 2 CLOSED

Which error message exactly do you have? Can you provide a log excerpt around the message?

Is there a workaround where it would ban the above ports iteratively without having to use multiport

Yes, however it is a bit ugly - you have to define N singleport actions for N ports, with different chains or modify the action to add N chains with 1 ipset, etc. There are many variants.

Also you can try another action if your distro supports another net-filter, like nftables.

Alternatively just switch to iptables-allports action:

banaction = iptables-allports

Sure that would ban the IP completely regardless the port, but if false positives are almost to neglect, it'd be also an option.

from fail2ban.

Thank you for the reply! In my case, I had run the system update just before installing fail2ban and the system update had updated the Kernel.

I guess there was some issue with using iptables kernel modules with the partial update without a reboot.

After reboot, things worked perfectly well with iptables-multiport.

Also a side note, I had originally tried to reach out to the fail2ban-users mailing list, but I couldn't find the full mail address anywhere :( Could you please document the mailing list address somewhere? I tried [email protected] but the mail bounced.

Once again, thank you for your reply, closing this issue.

from fail2ban.